embeddable-dll-service: add more robust example for .NET 5

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/embeddable-dll-service/csharp/TunnelDll/Service.cs b/embeddable-dll-service/csharp/TunnelDll/Service.cs
new file mode 100644
index 00000000..7f2c622e
--- /dev/null
+++ b/embeddable-dll-service/csharp/TunnelDll/Service.cs
@@ -0,0 +1,117 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
+ */
+
+using System;
+using System.IO;
+using System.IO.Pipes;
+using System.Runtime.InteropServices;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Threading;
+
+namespace Tunnel
+{
+    public class Service
+    {
+        private const string LongName = "WireGuard Demo Box";
+        private const string Description = "Demonstration tunnel for testing WireGuard";
+
+        [DllImport("tunnel.dll", EntryPoint = "WireGuardTunnelService", CallingConvention = CallingConvention.Cdecl)]
+        public static extern bool Run([MarshalAs(UnmanagedType.LPWStr)] string configFile);
+
+        public static NamedPipeClientStream GetPipe(string configFile)
+        {
+            var pipepath = "ProtectedPrefix\\Administrators\\WireGuard\\" + Path.GetFileNameWithoutExtension(configFile);
+            return new NamedPipeClientStream(pipepath);
+        }
+
+        public static void Add(string configFile, bool ephemeral)
+        {
+            var tunnelName = Path.GetFileNameWithoutExtension(configFile);
+            var shortName = String.Format("WireGuardTunnel${0}", tunnelName);
+            var longName = String.Format("{0}: {1}", LongName, tunnelName);
+            var exeName = Process.GetCurrentProcess().MainModule.FileName;
+            var pathAndArgs = String.Format("\"{0}\" /service \"{1}\" {2}", exeName, configFile, Process.GetCurrentProcess().Id); //TODO: This is not the proper way to escape file args.
+
+            var scm = Win32.OpenSCManager(null, null, Win32.ScmAccessRights.AllAccess);
+            if (scm == IntPtr.Zero)
+                throw new Win32Exception(Marshal.GetLastWin32Error());
+            try
+            {
+                var service = Win32.OpenService(scm, shortName, Win32.ServiceAccessRights.AllAccess);
+                if (service != IntPtr.Zero)
+                {
+                    Win32.CloseServiceHandle(service);
+                    Remove(configFile, true);
+                }
+                service = Win32.CreateService(scm, shortName, longName, Win32.ServiceAccessRights.AllAccess, Win32.ServiceType.Win32OwnProcess, Win32.ServiceStartType.Demand, Win32.ServiceError.Normal, pathAndArgs, null, IntPtr.Zero, "Nsi\0TcpIp", null, null);
+                if (service == IntPtr.Zero)
+                    throw new Win32Exception(Marshal.GetLastWin32Error());
+                try
+                {
+                    var sidType = Win32.ServiceSidType.Unrestricted;
+                    if (!Win32.ChangeServiceConfig2(service, Win32.ServiceConfigType.SidInfo, ref sidType))
+                        throw new Win32Exception(Marshal.GetLastWin32Error());
+
+                    var description = new Win32.ServiceDescription { lpDescription = Description };
+                    if (!Win32.ChangeServiceConfig2(service, Win32.ServiceConfigType.Description, ref description))
+                        throw new Win32Exception(Marshal.GetLastWin32Error());
+
+                    if (!Win32.StartService(service, 0, null))
+                        throw new Win32Exception(Marshal.GetLastWin32Error());
+
+                    if (ephemeral && !Win32.DeleteService(service))
+                        throw new Win32Exception(Marshal.GetLastWin32Error());
+                }
+                finally
+                {
+                    Win32.CloseServiceHandle(service);
+                }
+            }
+            finally
+            {
+                Win32.CloseServiceHandle(scm);
+            }
+        }
+
+        public static void Remove(string configFile, bool waitForStop)
+        {
+            var tunnelName = Path.GetFileNameWithoutExtension(configFile);
+            var shortName = String.Format("WireGuardTunnel${0}", tunnelName);
+
+            var scm = Win32.OpenSCManager(null, null, Win32.ScmAccessRights.AllAccess);
+            if (scm == IntPtr.Zero)
+                throw new Win32Exception(Marshal.GetLastWin32Error());
+            try
+            {
+                var service = Win32.OpenService(scm, shortName, Win32.ServiceAccessRights.AllAccess);
+                if (service == IntPtr.Zero)
+                {
+                    Win32.CloseServiceHandle(service);
+                    return;
+                }
+                try
+                {
+                    var serviceStatus = new Win32.ServiceStatus();
+                    Win32.ControlService(service, Win32.ServiceControl.Stop, serviceStatus);
+
+                    for (int i = 0; waitForStop && i < 180 && Win32.QueryServiceStatus(service, serviceStatus) && serviceStatus.dwCurrentState != Win32.ServiceState.Stopped; ++i)
+                        Thread.Sleep(1000);
+
+                    if (!Win32.DeleteService(service) && Marshal.GetLastWin32Error() != 0x00000430)
+                        throw new Win32Exception(Marshal.GetLastWin32Error());
+                }
+                finally
+                {
+                    Win32.CloseServiceHandle(service);
+                }
+            }
+            finally
+            {
+                Win32.CloseServiceHandle(scm);
+            }
+        }
+    }
+}